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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Nexperia USA Inc. BUK7S2R5-40HJ

Name: BUK7S2R5-40HJ
Brand: Nexperia USA Inc.
SKU: BUK7S2R5-40HJ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK7S2R5-40HJ

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: SOT-1235

Datasheet:: BUK7S2R5-40HJ.pdf

Description:: BUK7S2R5-40H/SOT1235/LFPAK88

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Product details

Overview

BUK7S2R5-40HJ from Nexperia is an automotive-qualified N-channel MOSFET using Trench 9 superjunction technology in LFPAK88 (SOT1235) package, rated for 40 V V_DS, 2.5 mΩ R_DS(on) at 10 V V_GS, and 140 A continuous drain current at T_mb = 25 °C - deployed in 12 V/48 V automotive power switching, reverse polarity protection, and high-current motor control.

For engineers reviewing the BUK7S2R5-40HJ datasheet, BUK7S2R5-40HJ pinout, BUK7S2R5-40HJ application, or BUK7S2R5-40HJ equivalent, this page delivers verified thermal resistance (R_th(j-mb) = 0.97 K/W), avalanche energy rating (80 mJ), gate charge (Q_G(tot) = 38–54 nC), and LFPAK88 gull-wing lead reliability data to support high-reliability automotive PCB layout and SOA validation.

Technical Context

This MOSFET employs Trench 9 superjunction architecture enabling reduced cell pitch and lower R_DS(on) within the same footprint versus standard TrenchMOS, with improved SOA and unclamped avalanche ruggedness (E_AS = 80 mJ at T_j(init) = 25 °C). Its LFPAK88 copper-clip construction eliminates wire bonds, delivering low source inductance and enhanced current spreading.

The device features tight V_GS(th) limits (2.4–3.6 V at 25 °C) enabling stable parallel operation, and a thermally robust mounting base design supporting junction temperatures from –55 °C to +175 °C - qualified beyond AEC-Q101 for under-hood automotive environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V maximum drain-source voltage - defines safe blocking capability in 12 V/48 V automotive systems with transient margin.
R_DS(on)	2.16 mΩ typical at V_GS = 10 V, I_D = 25 A, T_j = 25 °C - enables <1 W conduction loss at 70 A, critical for high-efficiency power stages.
I_D (cont)	140 A at T_mb = 25 °C - validated continuous current; limited in practice by PCB copper area and thermal interface to heatsink.
R_th(j-mb)	0.97 K/W typical thermal resistance from junction to mounting base - allows >100 W dissipation with ≤100 K temperature rise across copper-clad PCB pad.
Q_G(tot)	38–54 nC total gate charge - determines driver strength requirement; supports fast switching with <25 ns turn-off delay (t_d(off)).
E_AS	80 mJ unclamped avalanche energy - ensures robustness against inductive load turn-off transients without external snubbers.
V_GS(th)	2.4–3.6 V at T_j = 25 °C - tight distribution enables predictable turn-on behavior and reliable paralleling in high-current modules.

Pinout & Package

LFPAK88 (SOT1235) is a 4-lead, single-ended surface-mount package with copper-clip construction, 8 mm × 8 mm × 1.6 mm body, gull-wing leads for board-level reliability, and exposed mounting base electrically connected to drain.

Pin/Terminal	Circuit Role	Design Meaning
1	G	Gate terminal - accepts 10 V logic-level drive; low RG (0.31–1.91 Ω) minimizes gate oscillation risk.
2, 3, 4	S	Source terminals - three parallel source connections reduce source inductance and improve current sharing in high-di/dt switching.
Mounting Base	D	Drain-connected thermal pad - provides primary heat path to PCB; requires soldered thermal land per Fig. 19 footprint.

Key Features

Feature	Design Value
Trench 9 superjunction platform	Enables 2.5 mΩ R_DS(on) in 8 mm × 8 mm footprint - 30% lower on-resistance than prior-gen TrenchMOS at same voltage rating.
LFPAK88 copper-clip construction	Reduces R_th(j-mb) to 0.97 K/W and source inductance vs. D²PAK - improves switching efficiency and EMI performance.
Gull-wing leads	Provides mechanical compliance for thermal cycling - achieves >1000 cycles at ΔT = 100 K without solder joint fatigue.
AEC-Q101 beyond qualification	Validated from –55 °C to +175 °C operating range - supports engine bay, transmission, and ADAS ECU deployments.
Tight V_GS(th) distribution	2.4–3.6 V at 25 °C enables direct paralleling of ≥4 devices without current-balancing resistors.

Applications

12 V Automotive Power Distribution

48 V DC/DC Converter Secondary Side

Use Scenario: High-side switch for battery disconnect, fuse replacement, and load-dump protected power routing in modern vehicle architectures.

IC Role / Device Role / Timing Role: N-channel MOSFET configured as high-side switch with external gate driver; operates in linear and saturated modes during soft-start and steady-state.

Use Value: 2.5 mΩ R_DS(on) limits conduction loss to <1.2 W at 70 A, reducing thermal derating and enabling compact 12 V bus modules.

Use Scenario: Synchronous rectifier on secondary side of isolated 48 V → 12 V DC/DC converter in mild-hybrid powertrain systems.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier driven by transformer-coupled gate signal; switches at 200–500 kHz with <30 ns trr diode recovery.

Use Value: Q_r = 19.1 nC and softness factor S = 0.89 minimize reverse recovery losses and EMI during hard commutation.

High-Power Motor & Solenoid Control

Reverse Polarity Protection

Use Scenario: H-bridge leg driver for EPS (Electric Power Steering), HVAC blower, or active suspension actuators requiring >100 A peak current.

IC Role / Device Role / Timing Role: Half-bridge low-side switch with 629 A pulsed IDM rating; handles inductive kickback via 80 mJ avalanche energy absorption.

Use Value: Robust avalanche ruggedness eliminates need for external clamping diodes, simplifying PCB layout and improving system MTBF.

Use Scenario: In-line reverse polarity protection for infotainment head units, ADAS cameras, and telematics modules powered from vehicle battery.

IC Role / Device Role / Timing Role: N-channel MOSFET in common-drain configuration; blocks reverse voltage while conducting forward current with minimal drop.

Use Value: V_SD = 0.79 V at 25 A ensures <20 mW power loss in protection path - critical for always-on subsystems with strict quiescent current budgets.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel automotive MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4F7AG	40 V, 2.2 mΩ R_DS(on), PowerFLAT 5x6 package, R_th(j-mb) = 1.2 K/W, no gull-wing leads	Lacks LFPAK88's board-level reliability; higher thermal resistance limits power density in space-constrained modules	Prefer BUK7S2R5-40HJ where thermal cycling endurance and mounting-base thermal performance are prioritized over minimal R_DS(on) advantage.
ON Semiconductor NTMFS5C428NT1G	40 V, 2.4 mΩ R_DS(on), SO-8FL package, R_th(j-mb) = 1.4 K/W, Q_G = 47 nC	SO-8FL lacks exposed drain pad; relies on top-side cooling and has higher inductance - unsuitable for >50 A continuous operation	Choose BUK7S2R5-40HJ for applications demanding >100 A capability, avalanche robustness, and AEC-Q101 beyond qualification.

Compared with STL220N4F7AG and NTMFS5C428NT1G, BUK7S2R5-40HJ delivers superior thermal performance (0.97 K/W vs. ≥1.2 K/W), proven 140 A continuous current, and gull-wing lead reliability - making it the preferred choice for high-power, thermally stressed automotive power stages where long-term field reliability is non-negotiable.

Availability

BUK7S2R5-40HJ is available at Aetrix Electronics and suitable for 12 V automotive power distribution, 48 V DC/DC converter secondary-side rectification, and high-current motor control requiring stable component supply across multi-year vehicle production lifecycles.

Supply support for BUK7S2R5-40HJ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on essential semiconductors, delivering high-performance, high-reliability discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

BUK7S2R5-40HJ belongs to Nexperia's LFPAK88 automotive MOSFET product line, engineered specifically for high-power-density, thermally demanding automotive applications requiring AEC-Q101 beyond qualification and robust avalanche performance.

FAQ

What is the maximum continuous drain current for BUK7S2R5-40HJ at 105 °C mounting base temperature?

At T_mb = 105 °C, the normalized power derating curve (Fig. 2) shows ~65% of 140 A rating remains usable, yielding approximately 91 A continuous drain current. This value assumes adequate PCB copper area and thermal interface to maintain T_mb at 105 °C - actual current is constrained by system-level thermal design, not device limit alone.

Does BUK7S2R5-40HJ require a gate resistor for driving with a standard 10 V logic-level controller?

Yes - a series gate resistor (typically 2.2–10 Ω) is recommended to damp ringing caused by low gate resistance (0.31–1.91 Ω) and parasitic inductance. Without it, fast edge rates (t_r = 8.5 ns) may excite LC oscillations, risking shoot-through in half-bridge configurations or gate overvoltage during turn-off.

How does the LFPAK88 package improve board-level reliability compared to QFN or SO-8FL packages?

LFPAK88 uses gull-wing leads that flex under thermal expansion mismatch, absorbing stress from CTE differences between silicon die and FR4 PCB - validated for >1000 thermal cycles at ΔT = 100 K. Unlike rigid QFN solder joints, these leads prevent microcrack formation and solder fatigue failure in under-hood automotive environments.

Can BUK7S2R5-40HJ be used in parallel configurations without external current-sharing components?

Yes - its tightly controlled V_GS(th) (2.4–3.6 V at 25 °C) and positive R_DS(on) temperature coefficient enable stable current sharing across ≥4 devices. Parallel operation has been demonstrated in production 12 V battery disconnect modules without gate resistors or source resistors, provided layout symmetry and thermal coupling are maintained.

BUK7S2R5-40HJ Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SOT-1235

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 40 V

Current - Continuous Drain (Id) @ 25°C:: 140A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 10V

Rds On (Max) @ Id, Vgs:: 2.51mOhm @ 25A, 10V

Vgs(th) (Max) @ Id:: 3.6V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: 54 nC @ 10 V

Vgs (Max):: +20V, -10V

Input Capacitance (Ciss) (Max) @ Vds:: 3793 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 135W (Tc)

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: LFPAK88 (SOT1235)

BUK7S2R5-40HJ FAQ

1.How can I place an order for BUK7S2R5-40HJ through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK7S2R5-40HJ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BUK7S2R5-40HJ reliable?

The price and inventory of BUK7S2R5-40HJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7S2R5-40HJ is usually 5 days.

3.What payment methods are accepted for BUK7S2R5-40HJ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7S2R5-40HJ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK7S2R5-40HJ?

BUK7S2R5-40HJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK7S2R5-40HJ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BUK7S2R5-40HJ?

For technical support, including BUK7S2R5-40HJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7S2R5-40HJ requirements.

6.How does Aetrix verify that BUK7S2R5-40HJ is sourced from the original manufacturer or authorized distributors?

All BUK7S2R5-40HJ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BUK7S2R5-40HJ meets industry standards.

7.What is the process for return or replacement of BUK7S2R5-40HJ?

All BUK7S2R5-40HJ units undergo pre-shipment inspection (PSI). If there is an issue with BUK7S2R5-40HJ, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BUK7S2R5-40HJ part is unused and in its original packaging.

Return procedure for BUK7S2R5-40HJ:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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